After switching to a new PC (Windows 8.1 Pro x64), I have trouble to connect to the SmoothieBoard via Pronterface/Repetier Host.
When I plugged in the Smoothieboard for the first time it automatically installed the sd-card drivers and I have no problem accessing it, also when installing the SmoothieBoard drivers itself there was no problem.
Then I opened up Repetier Host and connected to the printer, but it keeps saying "# Command Waiting" and that number adds up when I send a command. With PronterFace I get the following error: "[Error 31] A device attached to the system is not functioning".

I already removed (reboot PC) and reinstalled the drivers (first 1.0 and second 1.1), but at most I can send 1 command (like HOME) and then it stops responding. Also updated the firmware on the board itself, but no improvements.
Tried 3 differend USB cables & other USB ports.
I also have tried it on 2 other pc's (also with Windows 8.1 Pro x64) and with those pc's it works flawlessly.

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